Double-row six-cylinder radial type common-rail oil feed pump

Abstract

The invention relates to a double-row six-cylinder radial type common-rail oil feed pump. An axial center hole and six radial installation cavities which are evenly distributed on the periphery of the axial center hole in a surrounding mode are installed inside a pump body, the six radial installation cavities are installed in the axial direction of the pump body and are separated into two rows, and the six radial installation cavities are separated into three rows in the circumferential direction of the pump body; a cam shaft is installed inside the axial center hole, and the rear end of the cam shaft is connected with an oil delivery pump installed on the rear end face of the pump body; two oil inlet proportional valves are installed on the outer side of the pump body, and low-pressure oil passages connected in parallel and installed inside the pump body are respectively connected with the oil inlet proportional valves and the oil delivery pump; a pump oil component is installed inside each radial installation cavity of the pump body, and low-pressure oil passages connected in parallel and installed inside the pump body are respectively connected with the oil inlet proportional valves and the pump oil components; and two eccentric cams are installed on the cam shaft, and each eccentric cam is correspondingly matched with three pump oil components on the same row. The double-row six-cylinder radial type common-rail oil feed pump can simultaneously meet performance requirements of large oil quantity, high rotation speed, low peak torque, the compact structure, the redundancy rate and the like, and can adapt to requirements of diesel engines which are high in power per liter.

Description

technical field [0001] The invention relates to a high-pressure oil supply pump, in particular to a double-row six-cylinder radial common-rail oil supply pump used in a diesel engine electronically controlled high-pressure common-rail system. Background technique [0002] The electronically controlled high-pressure common rail system can realize the flexible control of fuel injection volume, fuel injection times and fuel injection pressure, and can produce high-quality atomized fuel with a pressure of 0-200MPa, which is the main factor for diesel engines to achieve low emission, high efficiency and other performance indicators Technical solutions. The high-pressure fuel supply pump is the main hydraulic component of the common rail system, and its function is to provide high-pressure fuel regularly and quantitatively for the common rail system. In the prior art, common rail oil supply pumps for diesel engine common rail systems are mainly divided into two structural types, ...

AI Technical Summary

Problems solved by technology

In the prior art, common rail oil supply pumps for diesel engine common rail systems are mainly divided into two structural types, one is an in-line common rail oil supply pump designed to meet the needs of medium or heavy-duty diesel engines with higher power and lower speed , such as the CP2 common rail pump of Bosch Company in Germany (US patent application number US 6769413 B2), the HP0 series common rail pump produced by Denso Corporation of Japan (China patent application number 200610159422.9), and the ball valve type high pressure common rail fuel injection pump of Wuxi Weifu Company (Chinese Patent Application No. 200710025966.0), Liaoning Xinfeng Company's in-line common rail pump for common rail system (Chinese Patent Application No. Publication number CN202001163U), etc., the main structural feature of this type of common rail pump is that two or more oil pumping parts are axially arranged according to the power demand of the engine, and the camshaft has 1, 2 or 3 protrusions to realize multiple oil supply , this in-line common rail oil supply pump can also achieve a large amount of oil supply at low speeds, but limited by the plunger spring space, the maximum speed of the oil supply pump is generally not higher than 3000 rpm, and the overall structure is large , high peak drive; and the other is a radial common-rail oil supply pump designed to meet the needs of small-power, high-speed, compact passenger or light-duty diesel engines, such as the HP3 common-rail rotor pump of Denso Corporation (China Patent application number 200510120352.1), Bosch's common rail rotor pump (patent number CN 101010508 A), Siemens' common rail rotor pump (patent number CN 1871434A), etc., there are 1 to 4 oil pumping parts arranged in the radial direction of the oil pump , the camshaft cam generally has a single-protrusion structure, and each oil pumping part works separately in each cycle of the oil pump. The radial oil supply pump has a compact structure, high speed and low driving torque, and its oil supply can meet the needs of diesel engines with low power.

[0003]With the improvement of diesel engine emissions and economic performance, the power per liter of modern diesel engines is gradually increasing, which requires the matching common rail fuel pump to have a speed range at the same time Wide, compact structure, low driving torque, large oil supply, good reliability, etc., and the traditional two common rail oil supply pump structure types, of which the in-line common rail oil supply pump cannot meet the requirements of compact structure, high speed and low driving torque Requirements, the radial common rail oil supply pump cannot take into account the performance requirements of large oil supply, and each radial oil supply pump only has a solenoid valve to control the oil intake. When the solenoid valve is damaged, the oil pump will not work normally. The redundancy of the oil pump is poor. Based on the above reasons, it is necessary to innovatively design the common rail oil supply pump structurally to meet the needs of new diesel engines with higher power density.

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